Hoist attachment for jacks



Feb. 12, 1952 Y J sc 2,585,856

HOIST ATTACHMENT FOR JACKS Filed Oct. 11, 1947 Patented Feb. 12, 1952 UNITED STAT E s ram OFFICE HOIST ATTACHMENT FORLIACKS James Schmieder,.-Austin,.Miiin.

Application October 11, 1947:, Sefial No; 7793319 2 Claims. (01. 2542) "and completely covers the same.

It is an object 'o'f my invention to'provide a hoist attachment for jacks which will permit lifting heavy objects vertically where it is impossible because of overhangingstructure teget a direct vertical pull on said object.-

It 'is another objectof my invention to prcvide a novel and improved hoist attachment for a large jack which is extremely simple and. inexpensive to manufacture while at the same time is highly efiicient in operation.

More specifically, it is an object to provide it a hoist attachment'for large "jacks having a boom with a horizontally disposed forwardly extending element adapted to have its outer end moved over a heavy object to be lifted even though only limited clearance is available above said object whereby "said object may be raised and moved from one position to another.

These and other objects and advantages of my invention will morefully appear from the 1 following description made i in connection with w the accompanying drawings, wherein like reference characters refer to similar parts throughout the several views and in which:

Figure 1 is a side elevational view of my attachment mounted on a wheeled jack showing the boom in lowered position in full lines and in raised position in dotted lines;

Figure 2 is an end elevational view of the device illustrated in Figure 1.

As illustrated in the accompanying drawings, I show a large wheeled jack such as the hydraulically operated jack 5 having a hydraulic cylinder 6 and extensible element 1 with a horizontal platform 8 mounted at the forward end of said extensible member I. A suitable jack frame 9 is mounted on wheels and carries the hydraulic cylinder 6. The extensible member 1 is pivotally connected to an intermediate portion of the frame 9 as by the pin l0 and the forward end of the hydraulic pumping cylinder 6 has a projectable rod actuated by the piston in said cylinder -6 and is connected to the extensible member by the link II at a point a substantial distance below the pivot I0. Operating handle [2 is pivoted to the frame 9 by the stub shaft 13, to which .is fixed atrockerwarm l4 which is adapted itO mechanically actuate said hydraulic pumping cylinder .6, said rocker arm being connected to the rear end ofthe piston working in said cylinder as .by the.-.linkl.5. A-suitable valve structure (not shown) prevents the back flow of fluid during the pumping operation "and .may be opened or.closed by the jackop'erator.

My hoist attachmentcoinpr'ises a both it boom l ii-and in the form of my invention illustra'ted'this' connectionis'made at the "point where the boom curves outwardlyto' form'the horizom -talforwardly-extending member Ha-5 I he strut *z-c is made up'of two-parallel steer-bars ri-the form shown, but could conceivably be made1n= a great-numberof-ways.-- A-transverse fcoting'flla is fixed to the bottom of said 'para-"lle1 bars'- and extends outwardly beyondthesides' thereof; Ehis footing in normal lowered position is adapted to abut the rear portion of the horizontal platform 8 and slides forwardly thereon as the platform 8 is raised. The strut 20 has a bend in the intermediate portion thereof and a brace 21 is connected therewith substantially adjacent said bend and extends substantially horizontally rearwardly therefrom to have its rear end connected to an intermediate portion of the normally sloping boom element Nib.

Means for attaching an object to be lifted are supplied at the free end of boom [6, such as the hook 22 adapted to receive and carry a chain or cable 23 which is fixed to an object to be lifted, such as an engine for a bus or automobile, as shown in Figure 1 and designated by the letter A.

The following is a description of the operation of my jack hoist. My device is well adapted to many uses and a typical example of these uses is the removal of engines from engine-in-therear buses and the like. With such buses it is very diflicult to remove the engine by use of a vertically operated pulley hoist due to the fact that the bus structure completely covers the engine. My horizontally extending boom can be moved under the body portion of the bus to overlie the engine and the hook 22 attached to a chain which has previously been fixed to the top of said engine. The engine is then raised up from its mountings a suflicient distance to enable it to be pulled out through the opening at the rear or side of the bus. As the hoist is raised the strut footing 20a slides forwardly on the top surface of the platform 8 and. swings the free end of the boom upwardly, the jack being operated in the conventional manner. Thereafter the jack hoist assembly with the engine attached thereto is rolled back away from the bus and the engine thereby removed therefrom.

The fact that an easily movable hoist is provided which is also adapted to carry an object while said object is being moved from one position to another makes this type of jack hoist particularly adapted to small garages and the like. It is a. particular advantage to have a movable hoist which is not confined within any particular limits such as overhead box cranes and the like. Also, my jack hoist costs only a small fraction of the price that must be paid for these more complicated box cranes and overhead hoists.

All garages are equipped with a jack similar to the one illustrated to which my boom could easily be attached to provide the hoist as previously described. Thus, it would be possible for small garages and the like to purchase this hoist attachment whereas they could not afford to put in the more expensive overhead cranes, which, in fact, are not as flexible in their possible uses as my hoist and cannot easily be used to remove heavy objects from under overhanging structures, a use to which my hoist is particularly adapted.

It will be seen that an extremely simple yet highly efiicient hoist attachment for large jacks has been provided which will enable heavy objects to be removed from overhanging structures, as has previously been described.

It will, of course, be understood that various changes may be made in the form, details, arrangement and proportions of the parts without departing from the scope of my invention.

What I claim is:

1. In combination with a wheeled jack having 4 a frame and a vertically extensible member with a flat surface at the top thereof, a hoist attachment comprising an A frame, the lower end of one leg of said A frame being pivotally mounted on said jack frame and the other leg of said A frame slidably engaging the fiat horizontal top surface of said extensible jack member, a horizontally disposed boom element having its rear extremity fixed to the apex of said A frame, said extensible jack member tilting said A frame on its pivotal connection with said jack frame to controllably raise and lower said horizontal boom element, and means for attaching an article to the free end of said boom element to be raised and lowered therewith.

2. A hoist attachment for a wheeled jack of the type having a rigid frame structure with a vertically shiftable element mounted thereon, said attachment comprising as essential elements only, a boom adapted to be pivotally connected to the frame of the jack, rearwardly of the vertically shiftable element of said jack, an elevating strut fixed in downwardly extending relation to an intermediate portion of said boom, means for making said strut member rigid relative said boom, the lower end of said strut being adapted to engage the vertically shiftable element of said jack with freedom for horizontal sliding movement thereon when said vertically shiftable element is raised and lowered to raise and lower the outer end of said boom, and means for attaching an article to be lifted to the free end of said boom.

JAMES SCHMIEDER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,725,952 Beebe Aug. 27, 1929 2,208,221 McCullough July 16, 1940 2,446,410 Couse Aug. 3, 1948 FOREIGN PATENTS Number Country Date 748,739 France Apr. 25, 1933 

